How do we become NS stockists/dealers? I am located in the US

Hey guys! Regarding the case studies- do we need a sizable collection of bits to begin or are we just saying what we would recommend? I have a small collection but mainly snaffles/eggbutts so now looking at what I'd need to keep on hand when performing bit fitting sessions & case studies. Is there a list or general consensus of supplies & the range of bits we'd need in our "bit kit"?